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ASTM A369 Grade FPA vs. SAE-AISI 6118 Steel

Both ASTM A369 grade FPA and SAE-AISI 6118 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is ASTM A369 grade FPA and the bottom bar is SAE-AISI 6118 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
23
Fatigue Strength, MPa 180
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 240
300
Tensile Strength: Ultimate (UTS), MPa 380
470
Tensile Strength: Yield (Proof), MPa 240
290

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
45
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.7
Embodied Energy, MJ/kg 18
23
Embodied Water, L/kg 46
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
93
Resilience: Unit (Modulus of Resilience), kJ/m3 150
220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 13
17
Strength to Weight: Bending, points 15
17
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0 to 0.25
0.16 to 0.21
Chromium (Cr), % 0
0.5 to 0.7
Iron (Fe), % 98.3 to 99.63
97.8 to 98.6
Manganese (Mn), % 0.27 to 0.93
0.5 to 0.7
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.1 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040
Vanadium (V), % 0
0.1 to 0.15